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Preparation of Corrosion Protective Coatings on Galvanized Iron from Aqueous Inorganic–organic Hybrid Sols by Sol–gel Method by Sang Il Seok; Jae Hong Kim; Kyung Hun Choi; Young Young Hwang is a Engineering article available to read on EtoBox.

What is Preparation of Corrosion Protective Coatings on Galvanized Iron from Aqueous Inorganic–organic Hybrid Sols by Sol–gel Method about?

New inorganic-organic hybrid precursors for corrosion protective coatings on galvanized iron were prepared by adding 3glycidyloxypropyltrimethoxysilane (GPS) to an aqueous nanosized boehmite solution. Transparent boehmite (AlOOH) sols were prepared at 100 8C by peptizing aluminum hydroxide cake, which was obtained from the reaction between aqueous aluminum chloride and aqueous ammonium hydroxide solution (pH 8). Three different types of precursor sols, such as pure boehmite, hydrolyzed GPS, and boehmite-GPS hybrid sols were prepared and they were deposited on ultrasonically cleaned galvanized iron plates by using dip coating technique at room temperature. All the coatings were cured at 100-180 8C for 0.5-5 h in air, and their anticorrosion behavior was studied by analyzing the potentiodynamic polarization curves at room temperature. It was observed that the coatings cured at 150 8C for 3 h with GPS to boehmite molar ratio=0.7 exhibited the maximum corrosion resistance property, which attributed to the formation of a dense microstructure by crosslinking of functionalized nanoparticles.

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Author

Sang Il Seok; Jae Hong Kim; Kyung Hun Choi; Young Young Hwang

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0257-8972)

Published

2006

Language

EN

Field

Engineering (Physical Sciences)